Hi meiringalber,
Please test the battery power. To verify that all units are operating on battery power, install batteries into the units. The Parents' Units should operate when they are removed from the Charging Bases (after the initial 15-hour charge) and the LCDs should be lit. The Nursery Unit should operate when the AC adapter is unplugged and the green Power Indicator should light up.
There may be times when the Parents' Unit and Nursery Unit lose connection with each other. However, if connection is lost, the Movement Sensor Pad will continue to monitor your baby and the alarm will sound in the nursery.
To reestablish the connection between the units,1. Press the Menu button on the Parents' Unit for two seconds. The Out-of-Range symbol will flash and a beep will sound.
2. Then press the Page button on the top of the Nursery Unit for two seconds.
3. The green Movement Indicator Light will flash once, a beep will sound, and the units will automatically reconnect.
4. When the connection is complete, the Out-of-Range symbol will stop flashing and the Parents' Unit will beep once.
Check if the unit has an Out-of-Range Indicator. See figure belowThe Out-of-Range Indicator will alert you when the Parents' Unit and the Nursery Unit are not in communication with each other. This may occur when the units are too far from each other, if the Parents' Unit is on when the Nursery Unit is off, or if the units have lost communication with each other. The Out-of-Range symbol will flash on the Parents' Unit and you will hear two beeps every eight seconds.
To turn this feature on or off:1. Press the Menu button until the Out-of-Range symbol appears.
2. "On" or "Off" will appear below. Use the Arrow buttons to make your selection.
3. Press the Select button.
4. Press the Menu button to change another feature setting or press the Exit button to end programming.
Hope it helps.
Thank you for using FixYa.